Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.100.0 - Page 637

Figure 100. Port Monitoring Example Enabling Flow-Based Monitoring Flow-based monitoring conserves bandwidth by monitoring only specified traffic instead of all traffic on the interface. This feature is particularly useful when looking for malicious traffic. It is available for Layer 2 and Layer 3 ingress and egress traffic. You can specify traffic using standard or extended access-lists. 1 Enable flow-based monitoring for a monitoring session. MONITOR SESSION mode flow-based enable 2 Define in access-list rules that include the keyword monitor. For port monitoring, Dell Networking OS only considers traffic matching rules with the keyword monitor. CONFIGURATION mode ip access-list Refer to Access Control Lists (ACLs). 3 Apply the ACL to the monitored port. INTERFACE mode ip access-group access-list Example of the flow-based enable Command To view an access-list that you applied to an interface, use the show ip accounting access-list command from EXEC Privilege mode. Dell(conf)#monitor session 0 Dell(conf-mon-sess-0)#flow-based enable Dell(conf)#ip access-list ext testflow Dell(config-ext-nacl)#seq 5 permit icmp any any count bytes monitor Dell(config-ext-nacl)#seq 10 permit ip 102.1.1.0/24 any count bytes monitor Dell(config-ext-nacl)#seq 15 deny udp any any count bytes Port Monitoring 637